Magnetoresistive sensor detectivity: A comparative analysis
Magnetoresistive sensor detectivity: A comparative analysis
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DOI：
10.1063/5.0038187
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发表时间：
2021-02-08
影响因子：
4
通讯作者：
Eames, P. G.
中科院分区：
文献类型：
--
作者：
Davies, J. E.;Watts, J. D.;Eames, P. G.
我们报告了使用磁隧道结 (MTJ) 和巨磁阻 (GMR) 元件的磁传感器的噪声性能特征。研究的每个传感器都有明显不同的噪声和探测能力。在我们测量的传感器中，基于 GMR 多层的传感器具有最低的噪声和探测率。然而，GMR 传感器的线性范围也明显较小。为了在传感器之间进行直接比较，我们将每个传感器的线性工作范围调整为相同。这在现象学上相当于修改通量浓度。缩放后，隧道磁阻 (TMR) 传感器的低频探测能力变得基本上等于 GMR 传感器的低频探测能力。使用缩放方法，我们能够将探测能力置于其他关键参数（即尺寸和功耗）的背景下。最后，我们使用该技术来检查基于使用当前记录设置 TMR 值的概念 MTJ 传感器的磁阻传感器性能的上限。
We report on the noise performance characteristics of magnetic sensors using both magnetic tunnel junction (MTJ) and giant magnetoresistance (GMR) elements. Each sensor studied has a notably different noise and detectivity. Of the sensors we measured, those based on GMR multilayers have the lowest noise and detectivity. However, the GMR sensor also has a significantly smaller linear range. To make a direct comparison between sensors, we scale the linear operating ranges of each sensor to be the same. This is the phenomenological equivalent of modifying the flux concentration. Upon scaling, the low frequency detectivity of the tunneling magnetoresistance (TMR) sensors becomes essentially equal to that of the GMR sensor. Using the scaling approach, we are able to place the detectivity in the context of other key parameters, namely, size and power consumption. Finally, we use this technique to examine the upper limit for magnetoresistive sensor performance based on a notional MTJ sensor using present record setting TMR values.